 /*******************************************************************************
  * Copyright (c) 2003, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.ui.properties;

 import java.net.*;

 import org.eclipse.core.runtime.*;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.swt.*;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.layout.*;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.ui.*;
 import org.eclipse.ui.dialogs.*;
 import org.eclipse.update.core.*;
 import org.eclipse.update.internal.ui.model.*;
 import org.eclipse.update.internal.ui.parts.*;
 import org.eclipse.update.internal.ui.UpdateUI;
 import org.eclipse.update.internal.ui.UpdateUIMessages;

 /**
  * @see PropertyPage
  */
 public class FeatureCopyrightPropertyPage extends PropertyPage implements IWorkbenchPropertyPage {
     /**
      *
      */
     public FeatureCopyrightPropertyPage() {
         noDefaultAndApplyButton();
     }

     protected Control createContents(Composite parent) {
         try {
             IFeatureAdapter adapter = (IFeatureAdapter) getElement();
             IFeature feature = adapter.getFeature(null);

             Composite composite = new Composite(parent, SWT.NULL);
             composite.setLayout(new GridLayout());

             Label label = new Label(composite, SWT.WRAP);
             GridData gd =
                 new GridData(
                     GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING);
             gd.widthHint = computeWidthLimit(label, 80);
             label.setLayoutData(gd);

             IURLEntry copyright = feature.getCopyright();
             String annotation = (copyright != null) ? copyright.getAnnotation() : null;

             if (annotation != null && annotation.length() > 0) {
                 label.setText(annotation);
                 final URL url = copyright.getURL();
                 String filename = (url != null) ? url.getFile() : null;
                 if (filename != null
                     && (filename.endsWith(".htm") || filename.endsWith(".html"))) { //$NON-NLS-1$ //$NON-NLS-2$
 Button button = new Button(composite, SWT.PUSH);
                     button.setText(UpdateUIMessages.FeatureCopyrightPropertyPage_showInBrowser);
                     button.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
                     SWTUtil.setButtonDimensionHint(button);
                     button.addSelectionListener(new SelectionAdapter() {
                         public void widgetSelected(SelectionEvent e) {
                             UpdateUI.showURL(url.toExternalForm());
                         }
                     });
                 }
             } else {
                 label.setText(UpdateUIMessages.FeatureCopyrightPropertyPage_noCopyright);
             }
             Dialog.applyDialogFont(parent);
         } catch (CoreException e) {
         }
         return null;
     }
     
     private int computeWidthLimit(Label label, int nchars) {
         GC gc = new GC(label);
         gc.setFont(label.getFont());
         FontMetrics fontMetrics= gc.getFontMetrics();
         gc.dispose();
         return Dialog.convertWidthInCharsToPixels(fontMetrics, nchars);
     }

 }

